Antonietto et al.—Ostracoda from the Lower Jurassic Moenave Formation
Alicenula Rossetti and Martens, 1998, Penthesilenula Rossetti and Martens, 1998, and Vestalenula Rossetti and Martens, 1998. To separate genera, these authors relied on carapace length/height/width (size) ratios and the presence, shape, and position of marginal teeth on the internal surface and keels along the free margin of the valves, but most of all on an analysis of soft parts. Until now, no attempts have been carried out to integrate
taxonomic approaches for fossil and living darwinulocopine species. Aside from carapace size ratios, the presence of morphological characters such as marginal inner teeth, keels along the free margin, and, obviously, soft parts has never been evaluated in fossil taxa. At the same time, there is no assessment of the rates of overlap of the valves along their free margins for the Recent taxa. A wide morphological analysis of key specimens from several families and superfamilies, especially those from the Paleozoic and Cenozoic, will lead to improve- ments on that topic. Such effort, however, is not in the scope of the present work.
Subclass Ostracoda Latreille, 1802
Superorder Podocopomorpha Kozur, 1972 Order Podocopida Sars, 1866
Suborder Darwinulocopina Sohn, 1988
Superfamily Darwinuloidea Brady and Norman, 1889 Family Darwinulidae Brady and Norman, 1889
Genus Suchonellina Spizharsky, 1937
Type species.—Suchonellina inornata Molostovskaya, 1980, by subsequent designation (herein).
Remarks.—The type species for Suchonellina was not assigned in the original description of the genus (Spikharsky, 1937), something that was tentatively corrected by Benson et al. (1961), who identified Cythere (Cytherella?) inornata McCoy in King, 1850 as Suchonellina cf. S. inornata Spikharsky, 1937. However, it was unnoticed to them that T.N. Spizharsky named this species assuming that it was similar to but not the same as Cythere (Cytherella?) inornata (hence the ‘cf.’,or conferre, from the Latin=compare to). Considering that Cythere (Cytherella?) inornata and S. inornata are not the same species, and that the binomial name S. inornata was first coined as such by Molostovskaya (1980), the present authors establish S. inornata as the type species of Suchonellina.
Suchonellina globosa (Jones, 1862) Figure 5.1–5.13
1862 1894
1951 ?1962
Candona (?) globosa Duff, 1842; Jones, p. 126, pl. 5, figs. 23, 24.
Darwinula globosa; Jones, p. 163, pl. 9, figs. 3, 4a, b.
non 1894 Darwinula globosa var. stricta Jones, p. 164, pl. 9, fig. 5.
Darwinula sp. (803); Wicher, p. 757, pl. 1, fig. 17a, b.
Darwinula (102); Christensen, p. 94, pl. 3, fig. 3a–g.
non 1963 Darwinula globosa; Dadlez and Kopik, p. 163, pl. 1, fig. 9.
1963 1964
?1979 ?1983 1983 1984
1987 1988
1995
2002 2006
653
Notocythere media excelsa Will, 1953; Dadlez and Kopik, p. 139, pl. 1, fig. 10.
‘Darwinula’ globosa (Jones, 1862); Anderson, p. 135, pl. 15, fig. 128.
Darwinula spp.; Sohn and Chatterjee, p. 584, pl. 1, fig. 6, pl. 2, figs. 1–3, 5–9, 14–16.
Darwinula liulingchuanensis Zhong, 1964; Wei et al., p. 172, pl. 53, fig. 5D, R.
Darwinula longovata;Wei,p.350,pl. 2, figs. 14–17. Darwinula sp.; Kietzke, p. 123, fig. 2J–N.
Darwinula longovata Wei; Wei et al., p. 172, pl. 53, fig. 6D, R.
Darwinula subovatiformis Su et al., 1980; Xu, p. 1286, pl. 2, fig. 4.
Darwinula sarytirmensis (sic) Sharapova [in
Mandelstam], 1947; Kietzke and Lucas, p. 27, fig. 2I–L.
Darwinula sp.; Schudack, p. 428, fig. 2A–F.
Darwinula maanshanensis Hou; Hou et al., p. 753, pl. 303, figs. 1–4.
Lectotype.—BMNH I 6086, designated by Anderson (1964).
Occurrence.—Rhaetian, Upper Triassic, Inner Moray Firth Basin, Linksfield, Elgin, Morayshire County, Scotland, UK (type locality) (Jones, 1862, 1894; Anderson, 1964). Upper Triassic, Wayaobu Formation, Shaanxi Province (Xu, 1988); Lower Jurassic, Ziliujing Formation, Sichuan Province, and Xialufeng Formation, Yunnan Province, China (Wei et al., 1983; Wei, 1984; Hou et al., 2002). Lower Rhaetian, Upper Triassic, Germany (Wicher, 1951). Lower Rhaetian, ‘Zbąszy- necka Series,’ Upper Triassic, Poland (Dadlez and Kopik, 1963). Upper Triassic, Upper Shale and Redonda members, Chinle Formation, and Sloan Canyon Formation, New Mexico, USA (Kietzke, 1987). Sinemurian to Toarcian, Lower Jurassic, Kayenta Formation, Glenn Canyon Group, Arizona, USA (Kietzke and Lucas, 1995). In the present work, extended to the Hettangian stage, Lower Jurassic, Whitmore Point Member, Moenave Formation, Arizona and Utah, USA.
Materials.—Carapaces: UMNH.IP 5303 (adult; 0.88mm L, 0.40mm H, 0.35mm W), UMNH.IP 5293 (adult; 0.94mm L, 0.47mm H, 0.39mm W), UMNH.IP 5301 (A-1 juvenile?; 0.80mm L, 0.41mm H, 0.34mm W), UMNH.IP 5292 (A-2 juvenile; 0.67mm L, 0.35mm H, 0.25mm W), UMNH.IP 5302 (A-3 juvenile; 0.63mm L, 0.31mm H, 0.20mm W), and UMNH.IP 5304 (A-4 juvenile; 0.50mm L, 0.27mm H, 0.17mm W). Valves: UMNH.IP 5296 (adult, left; 0.95mm L, 0.49mm H, 0.24mm W) and UMNH.IP 5297 (adult?, right; 0.84mm L, 0.43mm H, 0.18mm W).
Remarks.—The diagnosis of this species follows Jones (1862) and Anderson (1964). The original proposal of the species, however, is from Duff (1842), although it was not formally described or illustrated in that monograph. Its generic placement was changed to Suchonellina, as proposed by Spizharsky (1937) to accommodate Permo-Triassic darwinulocopine species from Russia. According to Rossetti and Martens (1998), the genus Darwinula presents different valve overlap and general
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